My ms250 is a great little saw. I overwork it and never dies. It seems to only work for a tankful of gas, On refilling, it will start right away, but letting it sit an hour or so and there is no starting it. Its in the shop now. Still under warranty, its done this since it was new, getting crazy. Find out in a few days what is wrong, unless I'm doing something wrong. I know stihl saws can be tempermental.